Compaction apparatus



COMPACTION APPARATUS Original Filed May 3, 1961 4 Sheets-Sheet 1 IS-"EBM INVENTOR.

WY L! E M. LAFFERTY AZWJQ/ /MM April 6, 1965 w. M. LAFFERTY 3,176,370

COMPACTION APPARATUS Original Filed May 3, 1961 4 Sheets-Sheet 2 INVENTOR.

WYLI E M.LAFFERTY April 6, 1965 w. M. LAFFERTY 3,175,370

COMPACTION APPARATUS Original Filed May 3, 1961 ASheets-Sheet 5 5 l a I INVENTOR.

WYLIE M. LA FFERTY p i 6, 1965 w. M. LAFFERTY 3,176,370

COMPACTION APPARATUS Original Filed May 3. 1961 4 Sheets-Sheet 4 INVENTOR. WYLIE M.LAFFERTY United States Patent I Original application May 3, 1961, Ser. No. 107,411, new

Patent No. 3,151,870, dated Oct. 6, 1964. Divided and this application May 11, 1964, Ser. No. 374,868

4 Claims. (Ci. 25-39) This application is a division of my copending application Serial No. 107,411, filed May 3, 1961, now Patent No. 3,151,870, granted October 6, 1964.

This invention relates generally to bell and spigot concrete pipe and has specific reference to an apparatus for manufacturing tamped concrete pipe having reinforced bell ends, together with a new and improved product.

Bell and spigot concrete pipe is formed as a unitary structure having spigot and bell ends. The spigot end has an interior wall which has the same diameter as the shank or body of the pipe, and an exterior wall, which has the same diameter as the pipe shank or which may be tapered. The bell end has interior and exterior diameters, which are larger than those of the spigot end, so that when the spigot end of an adjacent pipe is disposed within the bell end, as the pipe sections are assembled together the joint therebetween permits for substantially uninterrupted fluid flow within the pipe, by precluding the necessity of constricting the interior pipe diameter at the joint. When the exterior wall of the spigot end is tapered the interior of'the bell end is tapered complementary thereto.

The interior diameter of the bell end of the pipe is, therefore, greater than the interior diameter of the pipe shank by an amount equal to or slightly greater than twice the thickness of the pipe wall at the spigot end and the exterior diameter of the bell end is sufficiently large to provide a bell end wall having the desired structural strength.

For years it has been common to produce cast bell and spigot concrete pipe by using suitable metal, wooden or other forms, pouring the concrete therein, allowing suflicient time, up to 24 hours or more, for the concrete to set and then removing the pipe from the forms and permitting it to cure.

Thisprocess requires that the forms be used continuously for a period of 24 hours or more to produce a single length or section of pipe and a great many forms are necessary, therefore, in order to manufacture a relatively few sections of pipe. The process is, accordingly, slow and expensive in use and practice. The shank of cast concrete pipe could be and frequently was reinforced along its length by Wire mesh or other means.

Subsequently, it has become more common to provide tamped concrete pipe.

Tamped bell and spigot concrete pipe is also produced by the use of molds or forms of suitable size, shape and material. This process, however, utilizes an extremely viscous concrete slurry, having only about 6 percent moisture, or just slightly more than that necessary for hydration of the concrete. As the viscous concrete slurry is poured into the form, it is repeatedly tamped or impacted, automatically, by mechanical means, so as to compact the concrete to increase its density and thereby its strength and utility.

With tamped concrete pipe the forms may be removed substantially immediately upon completion of the pouring, as the concrete sets at once, using substantially all of the moisture present in the slurry to hydrate and the newly formed concrete pipe immediately has sufiicient strength to maintain its own shape and form while curing even though unsupported by the forms necessary for pouring. I Tamped concrete pipe has also been customarily manu- 3,1763% Patented Apr; 6, 1965 factured with reinforcing wire or mesh in the spigot end and pipe shank.

However, production problems, incident to forming the bell end of tamped concrete pipe have effectively precluded providing satisfactory metal reinforcement for the bell ends. Accordingly, it has been common to strengthen the bell end of concrete pipe by making the walls there of of greater thickness than the walls of the pipe section generally and of the spigot end in particular.

This has not been entirely successful, however, and the bell end of a concrete pipe section has been the weak portion of the structure. Pipe failures and breakage, both during and after installation, have occurred more frequently at the bell end than at any other part of the pipe section.

Accordingly, it has been found desirable to provide bell and spigot concrete pipe having reinforced bell ends, but the apparatus and method commonly used for manufacturing tamped bell and spigot concrete pipe is such that reinforcement of the bell end has precluded proper tamping and compacting the bell, particularly laterally exteriorly of the reinforcement and especially when, as is desirable, the reinforcement comprises a solid metallic cylinder disposed substantially intermediate the thickness of the bell end wall.

The general object of this invention, therefore, is to provide new and improved apparatus for tamping reinforced bells on tamped bell and spigot concrete pipe.

A further object of this invention is to provide new and improved apparatus for effectively and efliciently tamping the bell end of reinforced bell, tamped concrete pipe and more particularly for tamping and compacting such a bell end exteriorly of the reinforcement.

Other objects of this invention include the provision of improved apparatus for tamping the bell end of reinforced bell, tamped concrete pipe, which is efficient and economical in operation; which is economically manufactured and installed; which may be used with and mounted on existing apparatus without interfering with the normal use and function thereof; which effectively and efliciently compacts the reinforced bells, exteriorly of the reinforcement, to increase and improve the density and strength thereof; which effectively works and cooperates with and in conjunction with the bell packers now commonly used on tamped concrete pipe forming apparatus to form and provide an eflicient, strong bell end on reinforced bell, tamped concrete pipe; which is easily used by unskilled labor; which does not lengthen the manufacturing or pouring process; and, which does not, itself, induce or necessitate further or additional steps in the manufacture of reinforced bell, tamped concrete pipe.

Another object is to provide a new and improved reinforced bell and spigot concrete pipe.

These and other objects and advantages of this invention will become apparent in the specification, claims, and accompanying drawings, wherein:

FIGURE 1 is a broken schematic elevation view, partly in section, with certain parts omitted, of apparatus for producing tamped concrete pipe having associated therewith apparatus, for compacting the bell end of reinforced bell, tamped concrete pipe, embodying a preferred form of this invention;

FIGURE 2 is a partial top plan view of the apparatus shown in FIGURE 1;

FIGURE 3 is a partial elevation view on an enlarged 1 scale of a portion of the apparatus shown in FIGURE 1;

' tions of the form andcore'assembly 2,

concrete pipe ishiridicated generally; at l in FIGURE V The tamping means 24 includes one or more tampers or sticks '25 which'are adaptedto'extend into and between the'rforms l4 and 17 on both sides of the reinforcing apparatus 1 and are disposed atdia'metricallyopposed. per- The formsand core assembly 2 ofthe apparatus 1, t 7

comprises a frame 6, see FIGURE 3, which is supported ona suitable foundation and is atleast slightly more than twice as high as the length of the, :longest pipe to be produced in the apparatus. The frame 6 defines and forms opposed vertical track members 7. upon which a transversely extendingcross-memberor core lift beam 9,

having suitable wheels 10, is mounted'and-supported'for' reciprocal vertical movement. The cross-member 19 is and permit the cross-member 9 to be, lowered; in this re- J gard, the belts 13 are fixed to the member '9' at joints 130, and pass through piston reels 132 "and fixe dguide reels 134,'respectively.

The cross-member 9 is nonrotatably supported onand relative to the track members 7, and, in turn, supports and carries an inner form orcore 14.- The core'14 is formed of metal or other suitable material, has a height at least equal to the length-of the pipe section to be I produced thereon, and hasan exteriordiarneter equal to the interior diameter'of the-spigot'and shank ofthe pipe to be produced thereon.- The core 14 is, nonrotatably supported on cross-member'9 and the lengthof the track members 7 is sufficient so that the corefl may-be raised 1 completely out of the newly formed pipe section when it is desired toremove the pipesection from the ap;v

paratus 1. I I

The form' and core assembly 2 also includesi'a bottom mesh 26 so as to insure thatall of the concrete deposited within the form is compacted. The tamping means 24 also includes a friction clutch 27, which engages and supports the tampers with a frictional force ofpredetermined magnitude so that the tampers aredisplaced upwardly through the clutch whena force equal to or greater than apredetermined minimurnisexerted on'the lower exr t'remit-y of the tamper. Such a clutch 27 is well-known 'in the art, the structure thereof forming no part of the present invention. Tampers 2'5 are slid'within and are supported and guidedffor vertical motion by upper and lower guides 28 and 28, respectively; Tampers 25 are reciprocated by the clutch27 by means of a'crank' arm Stland an eccentric drive 31, which,in turn, is drivenby motor 33 in a conventional manner. The sticks of tempers 25 have 'shoelike members, not shown, at their 'lower extremities, which engage upon, compact and tamp the concrete as it accumulates within theforms.

By way of example, the ta-mpers 25 are conveniently reciprocated at approximately 600 strokes of about 4% inchilength, per minute, and deliver a 300-pound blow to the concrete. As the concrete;drops-within andbetween the forms, the t ampers 25 arereciprocated so as to push and compact the concrete, thereby increasing its density and insur-ing'that the forms are fully and corn pletely filled. As the level ofrthe concrete rises-with the V, the clutch 27 coincident withthe rise inthe level of the concrete within-the forms; Thus the entire'masstof concrete is tamped and compacted as the forms are filled, and no yoi-dsremain inthe completed section! ;-If desired,only one tamper 'trnachinea t need have tampersticks '25 and shoestnot shown) onboth sides V ofthe reinforcement 20, while the other. need have a assembly or table indicated generally atI15 (FIGURE 1) and an outer form 17 The bottom assembly or table'15, is supported by pin 18 in a suitable-driving apparatus (not shown) so as to be rotatable thereby and is adapted to support the core 14 and the form 17 so that the core lq remains stationary and the -form' 17- is rotated with; the I bottom-assembly. The outer form 17 defines and forms I the outer wall of the pipe sectiori albeit when the? exterior wall of the spigot end is tapered, the taper may be formed r by a portion of the bottom 'assemblylls, as shown in FIGURE l.-

is rotated with the table 15.

The form 17 is splitlongitudinally so as to have half sections which may be separated latenally, so that the newly formed .pipe can be removed from the apparatus.

As pointed out'above, tamped concrete pipe is formed;

from an extremely thick mud or slurry vhaving only about six percent moisture content and asja consequence, the

concrete,v when poured, is dense and flows' only slightly,

Accordingly, when tamped pipe is manufactured simply pouring the concrete into the form is notienoughp It must also be mechanically displaced, tamped or compacted into stick and a shoecn the outside :of the reinforcement only.

, a The tampersare in'fixedpositions relative to the form andcore' assembly 2 and frame-'6 and are brought into contactwitlr'all of theconcrete'b'y, therotationj of the table 15, which not only rotates the outer form 17 and V reinforcement 20 but, also, the concrete deposited within 1 size of the pipe being made, varying from a rate of 8 rpm for GO-inchJdiameterpipe 'to'45lrfp-m. for a 12- "inchjdiameterrpipe and being :chosenso that the'lineal speed-of a predetermined point on the pipe being formed is approximately 135 feet per minute.

a "The bell; end of the pipe, which, as noted above, is of 7 V larger-internal" diameter than. the rest of the pipe, is

the forms to form an extremely dense concrete having a 7 high strength.

To this end, the apparatus -1 also preferably includes two tamper machines 4, FIGURES 1 and 2. Each tamper" machine comprises a suitable'track means 22 upon which tamping means 24 is operatively'mounted' for selective reciprocal movement so thatthe tamping means 24 may ing on the sizepipe to, be produced. I

formed by means of onev or more, and preferably two,

bell packers 34,"see FIGURES 1,2, and 4. The bell packers 3 4,are adapted toYexert a lateral pressure upon the newly poured concrete to'for'm the. groove or internal configuration of;,the'bel-l end." Asgbest shown in FIG- URE 4, each bell packer 34 is fixedly secured, as, by welding or'othersuitab'le means,to;-the' core 1-4 and comprises a 'chann elilikei member having a lateral wall 36 which curves outwardly and rotationally rear-weirdly from the core, and has a vertical shape. at itsrearward end which is complementary to'and forms the interior lateral wall. of rthe bell end of the pipe, 5 Bell packer 34 also, in-

"cludesxa bottomfwall whichf forms the shoulder of the bell -end, 'anda't'op'wall' 39'. Each bell packer 34 pushesand compacts concretelaterallyfso asfto'form and shape the bell and to tamp anfd provide a greaterdensity in the bell than would occur without some compaction being efiectedupon the concreteas the'same is poured and the pipe bell isformed; V

As mentioned,two packers 34'are conveniently used in each rapparatus. andlone of these is usually disposed that the bell packer 34 can form the bell.

. of the pipe,

rotationally immediately after the feeder 40, FIGURE 2, by which the concrete is deposited between the forms 14 and 17, and the other diametrically opposite the first. The apparatus 1 also includes means, not shown, for lifting the concrete to the feeder 40.

In operation, to form tamped concrete pipe, the core "14 is lowered so as to rest upon the table 15, the outer form 17 is positioned as shown in FIGURE 1, and the reinforcement 20 is disposed intermediate core 14 and form 17.- The tamper machines 4 are then actuated to position the sticks 25 so that the tamping shoes are in the correst position relative to the forms and core and the sticks are lowered so that the shoes are adjacent the table.

The concrete is then admitted to the form through the feeder 40 and the tampers and the table are actuated so that the table rotates and the tampers compact and impact the concrete as it falls between the forms 14 and V 17, causing the same to flow into position and compacting it into a denser mass than would otherwise be obtained. As explained above, rotation of the table rotates the form 17, reinforcement and newly poured concrete relative to stationary core 14 and the tampers, and as the level of the concrete rises between the forms, the increased resistance met by the sticks causes the same to slip upwardly through the friction slip clutch 27 until the entire length of the pipe is formed. When the level ,of the concrete reaches the bell end of the pipe the packers 34 displace and exert a lateral pressure upon the concrete, thereby compacting the same laterally to form the interior of the bell and provide a bell of increased density.

Once the pipe forms are filled completely to the top the bell is formed, the tamper machine and table are stopped and within the matter of a minute or so the outer form is opened, the core withdrawn, and the new pipe sections removed to the curingroom for proper seasoning.

All of the above is old in the art and, per se, forms no part of the present invention.

It has been customary in the past, when forming reinforced tamped concrete pipe to terminate the wire mesh reinforcement 20 short of the bell end of the pipe so Recently it has been found desirable, as pointed out above, to provide also a metal reinforcement in the bell end of the pipe.

Of necessity, this reinforcement is offset radially from, and has a larger diameter than, the reinforcement 20, which extends longitudinally through the spigot and shank Such reinforcement is indicated at 44, in FIGURE 4, and preferably comprises a solid metallic cylinder having a diameter intermediate the interior and exterior diameters of the bell end of the pipe section.

When such reinforcement is used in tamped concrete pipe, the bell packer 34, while performing'the necessary function of forming the interior of the bell end thereof, cannot exert a lateral pressure through the reinforcement to the concrete deposited laterally outwardly thereof, and as a consequence, the bell packer 34 does not pack, compact or otherwise intensify the density of the concrete laterally outwardly of the reinforcement. The concrete in the bell end, therefore, is not uniform and does not have the strength and other characteristics desired.

This invention comprises means adapted to be mounted and supported on the apparatus 1 and more particularly on the lift beam or cross-member 9 which compacts and lamps the concrete laterally outwardly of the reinforcement 44 and is also useful for 'co-acting with the bell packers of an ordinary, tamped concrete, pipe forming machine to form an improved bell end having greater strength and density than has been obtained in the past with prior art machines and apparatus as described above.

Such apparatus is indicated generally at 45in FIG- URES 1 and 4 and is mounted on the beam 9 so that the form 17 and the pipe section being poured are rotated relative thereto. The apparatus comprises driving means adapted to engage the outer form 17 and to be activated by the rotation thereof and vertical packer means, adapted to be driven by said driving means and adapted to contact, roll upon and compact vertically the concrete in the bell, and particularly the area laterally outwardly of the bell reinforcement, as it is poured and rotated or displaced past the apparatus 45 by the rotation of the table 15.

Referring to FIGURE 4, the apparatus 45 preferably comprises a yoke or supporting member 47. The yoke 47 rotatably supports a driving wheel or roller means 48 which is selectively driven by engagement with the outer form 17, and a vertical bell packer roller or compacting means 50, which is adapted to engage the concrete to compact the same, and is driven by the driving wheel or by engagement with the compacted concrete.

The driving roller 48 has a smaller diameter than the compacting roller 53 and has a width such that it may continually and easily ride upon and be driven by frictional engagement with the form 17 as the form 17 is rotated relative to the apparatus 45 by the table 15. The compacting roller 50 has a somewhat larger diameter than driving roller 48, as mentioned, and has a width substantially equal to or slightly larger than the distance between the outermost point 62 (FIGURE 2) of the wall 36 of the bell packer 34 and the interior of form 17 to the end that the compacting roller engages and pushes, flows, compacts and exerts a vertically downward pressure upon all of the concrete forming the completed bell.

Preferably, the rollers 48 and 50 comprise a single unitary member, indicated generally at 51, the member 51 being rotatably supported by means of bearings 53, mounted on a shaft 54, which extends through oppositely disposed apertures 56 in yoke 47. Shaft 54 is preferably threaded as at 57 and detachably secured in yoke 47 by means of nut 59. When necessary, one or more washers 60 may also be disposed about shaft 54 in order properly to position member 51.

Alternatively, it is not without the scope of this invention to fixedly secure-the member 51 to a shaft which is rotatably supported in the yoke 47 or to form the driving roller 48 and the vertical bell packer roller 50 as separate cylindrical members fixedly secured to a common shaft, which is, in turn, rotatably supported in yoke 47.

The rollers 48 and 50 are positioned on and relative to the form 17 by means of a suitable motor 63, which is conveniently fluid actuated as by air or liquid. To this end, the yoke 47 is welded or otherwise secured to an arm 65, and the arm is eccentrically mounted on a shaft 66 of the motor 63, and is thereby actuated to raise and lower rollers 48 and 50, as desired into and out of engagement with the form 17 and the concrete, respectively.

The apparatus 45 also includes a base plate 67 (see FIGURE 2) which is bolted or otherwise secured to the cross-member 9. The base plate 67 is preferably detachably and adjustably secured to the cross-member 9 so that the apparatus 45 may be adjusted radially, relative to the form and core assembly 2, along the cross-member 9 so as to be properly positioned for forming and compacting the bell ends of pipes of various predetermined sizes and diameters. The base plate 67 is, also, preferably provided with an arcuate slot 68 through which one or more bolts 7 0, by which the base plate is secured to the cross-member 9, extends. The slot 63 permits the base plate and the apparatus 45, of which it is a part, to be rotated angularly relative to cross-member 9 to adjust the apparatus 45 and position the rollers 48 and 50 so that they are tangential to the form 17, regardless of the diameter and size of the pipe section being formed. Thus, the bas plate 67 is secured to cross-member 9 so as to be adjustable radially angularly in accordance with the size of the particular pipe 7 section to beformed by-loosening. the bolts 70 andjslid ing the base plate relative thereto along the slot 68.

Preferably, two apparatus 45-areused in each'appar'atus types and forms of tamped concrete pipe apparatus and I that other types a'ndxforrns of tamped concrete pipe may I be adapted 'for'use while embodying this invention.

1 at opposite ends of the cross-member 9,, as shown in 1 FIGURE ;2.

Also, the vertical bell'packers 45 are so positioned;

that the point of contact between the poured concrete and each compacting roller 50 is'substantially radially aligned with the point of contactbetween the adjacent bell packer 34 and the concrete. The concrete is, therefore, s'irnulw taneously subjected to the vertical force of the roller 50 of the apparatus 45 and the lateral force of theb'ellpacker 34. 1 I

When the size of the pipe to be formed on the appara tus 1 is changed, the rollers 48 and 50 are also convenient '1 7 Those skilled in the art will appreciate that various changes and modifications carrbe made to the invention herein described and disposed Without depantingfrorn thc spirit and scope thereof. The essential features'of the invention are defined in the appended claims.

I'claim; g

1 .111 apparatus for. manufacturing bell and spigot tamped concrete pipe, including a stationary core, a cross- 7 member supporting the core, a rotatable outer form hav- 7 ing a top edge anda lateral bell packer: secured to said ly and preferably changed in order to properly co-act with the particular forms 14 and 17 being used and pipe sec tion being formed. To. thisend, the rollers are easily replaced by loosening the nut 59, removing the shaft 54, 1

substituting the-new rollers for th old,and reassembling the shaft in the yoke. a

a The motor'63 preferably delivers aforce of about 1000 pounds to the member 5 1, which,.in turn, compacts and engages the form and/or the concrete with a forcefofi approximately 500 pounds. ,Thus'the pressure of the newly core and having side and bottom walls adapted to form they inside wall and shoulder of the bell end of, a pipe section, the improvement of a vertical hell packerfor compacting .the concrete vertically, laterally outwardly of said inside wall,'.said vertical'bellpacker comprising a base plate, amotor mountedon said base plate, support means mounted on said motor and adapted to be actuated thereby, a rollermeans carried by'said support means and having an edge adapted to engage-upon said top of said outer form and to be driven by engagement therewith when said outer form is -rctated,seconfdroller means poured concrete cannot raisethc member 51' and thecoricrete is displaced thereby in the manner set forth above;

In operation, it is preferred that as the level cfconcrete carried by said support means having an edge of greater diameter than said first rollerrneans for compacting the concrete in'tliebell laterally outwardly of said inside wall,

means operatively interconnecting; said roller means,

within the form approaches the" level of' the bell, the

motor 63 is actuated to cause the roller" 48 t'oengag'e and ride upon the rotating form 17, which rotates rollerl48-l and thereby compactingiroller 50. Roller 50 pushesfand displaces'the newly poured concrete downwardly into the f bell. Once the level of the concrete Within the bell cavity is ,suflicientl high and the concrete hasbeen compacted V sufl'iciently so thatthe coanp acting'roller '50 is'turned by Y frictional engagement withg-the concrete itself,ltheirnotor 63 is actuated to withdrawthe member 51. so thatthe.

apparatus 45, the motor 63 may-be provided with'an-fac, cumulator; In such an instance, if the roller 53 binds means.fordetachablysecuring said baseplate to said cross-mernber whereby said base plate is radially. and angula-rly adjustable onsaidcross rnember and relative to said core and outer form, s'aid motor means including means toxe xrt a predetermined pressure on:said roller means :to hold said roller "means in a i predetermined p0,

sition, and to raise. and lower said rollermeans selectively relative'to saidoutcr'form'. i 1 I p 1 2. Inapparatus for 'manufacturing bell: and spigot V tamped concrete pipe, including a stationary core, a crossmember supporting. the core, a rotatable outer torm having a topedge an d'alateral bell packer secured to said.

core and havingside and bottom walls adapted to .form the inside wa ll and shoulderof the bellend of a pipe 7' section, the improvement of a vertical 'be1l1packerfor compacting the concrete vertically, laterally outwardly of said inside wall; said vertical bell packer comprisinga baseplate, a motor mounted on said base plate, support 1 .means' mounted on said motor. andadapted to be actuated on the form or engages a rock orother foreign 'or .del-

eterious matter. in the concrete, the increased pressure resulting from theincompressibility thereof, can overcome the pressure in. the accumulator thereby permitting "the member 51 to lift or raise until the obstructionis passedf The apparatus 45 and disclosed 'methodmay' alsob'e advantageously used to form, tamped concretepipewhich;

doesnot have a reinforced bell; asit cooperates with, the bell packer 34 to provide a bellofunexpectedly in-.

creased density and greater strength than is obtained by the use of a conventional bellpacker alone.

. From the foregoing descriptionof a preferred fonn of ,this'invention it will be, evident that there has been provided a new and improved method and apparatus for compacting and increasing the density and strength ct'the hell or tamped 'concretepipe, and more particularly for tamping, compacting and properly forming the laterally outwardly portions of thebell ends of reinforced bell tamped concrete pipe to provide afnotably improved prod- 7 not. Such method and apparatus is' economically used ventionaltamped' concrete pipe machinery nowfin. ex istence, and does not in any way. interfere with-the use and operation of the other parts and portions of the mae 1' thereby, a rrolle'r member. rotatably mounted on said support means, said roller member having a first cylindrical portionhaving an'edg'e for engagement upon said top of said oute-rl-for m. and to be drive'nby engagement therewith when said outer form is rotated and a second cylindrical portion having an edgeof greater diameter than'said 'fir'st portion and a; width substantially equal to the distance betweensaid-lateral bell packer and said. outer form for compacting 'the'concrete. in. the bell laterally outwardly ot-saidfinside wall, rnejans detachably 'securingtsaid base plate to said cross-member..whereby sa-id base plate is radial-1y and angularlyadjustablev on said cross-member and relative'to said core and outer form, said motor including means to exenta predetermined pressure on sald roller member to hold said roller member in a predeterchinery upon which itisrnounted or adapted for, mount; 7

s v It is to be understood that apparatus,

method, and V .productembodying this invention may he used with other.

mined position, and to raise and lower said roller selectively relative to said outer form.

I 3. In-apparatus. for manufacturing bellj and spigot member tamped concrete qpipe including a stationary core, a I v v a cross-member su ortim the core, a rotatable outer torm and manufactured. It is readily adapted for use on 'cona Pp D I having atop edge andia later al bell packer'secured to said core and ,havingside andbottomwa-lls adapted to form" the inside wall and shoulder of the bell end of a pipe section, thefimprove'inent of a vertical bell packer tor compacting the. concrete ertically, laterally outwardly of said inside wall, said vertical bell packer comprising 'a base plate, a motor mounted on said base plate, a support means mounted on said motor and adapted to be actuated thereby, a roller member rotatably mounted on said support means, said roller member having a first cylindrical portion with an edge for engagement upon said top of said outer form and to be driven by engagement therewith when said outer form is rotated and a second cylindrical portion having an edge of greater diameter than said first portion and a width substantially equal to the distance between said lateral bell packer and said outer form for compacting the concrete in the bell laterally outwardly of said inside Wall, said base plate having an arcuate slot therein and means, a portion of which extends through said slot, for detachably securing said base plate to said cross-member, said base plate being radially and angularly adjustable on said cross-rnember and relative to said core and outer form, said motor including means to exert a predetermined pressure on said roller member to hold said roller member in a predetermined position, and to raise and lower said roller member selectively relative to said outer form.

4. In apparatus (for manufacturing bell and spigot I tamped concrete pipe including a stationary core, a cross-member supporting the core, a rotatable outer form having a top edge and a lateral bell packer secured to said core and having side and bottom walls for forming the inside wall and shoulder of the bell end of a pipe sec- 7 ition, the improvement of a vertical bell packer for coma roller member rotatably mounted on said shaft, said roller member having a first cylindrical portion with an edge for engagement upon said top of said outer form and to be driven by engagement therewith when said outer form is rotated, and a second cylindrical portion having an edge of greater diameter than said first portion and a width substantially equal to the distance between said lateral bell packer and said outer form for compacting the concrete in the bell laterally outwardly of said inside wall, said base plate having on arcua-te slot therein and means, a portion of which extends through said slot, for detachably securing said base plate to said cross-member, said base plate being radially and angularly adjustable on said cross-member and relative to said core and outer form, said motor including means to exert a predetermined pressure on said roller member to hold said roller member in a predetermined position, and to raise and lower said roller member selectively relative to said outer form.

References Cited by the Examiner UNITED STATES PATENTS 44,369 9/64 Holden 2537 1,359,543 11/20 Smith 25--37 1,750,138 3/30 Sorenson 2537 1,813,772 7/31 Schultz 25-36 2,306,496 12/42 Petersen 2537 FOREIGN PATENTS 513,884 11/20 France.

MICHAEL V. BRINDISI, Primary Examiner.

ROBERT F. WHITE, Examiner. 

1. IN APPARATUS FOR MANUFACTURING BELL AND SPIGOT TAMPED CONCRETE PIPE, INCLUDING A STATIONARY CORE, A CROSSMEMBER SUPPORTING THE CORE, A ROTATABLE OUTER FROM HAVING A TOP EDGE AND A LATERAL BELL PACKET SECURED TO SAID CORE AND HAVING SIDE AND BOTTOM WALLS ADAPTED TO FORM THE INSIDE WALL AND SHOULDER OF THE BELL END OF A PIPE SECTION, THE IMPROVEMENT OF A VERTICAL BELL PACKER FOR COMPACTING THE CONCRETE VERTICALLY, LATERALLY OUTWARDLY OF SAID INSIDE WALL, SAID VERTICAL BELL PACKER COMPRISING A BASE PLATE, A MOTOR MOUNTED ON SAID BASE PLATE, SUPPORT MEANS MOUNTED ON SAID MOTOR AND ADAPTED TO BE ACUTATED THEREBY, A ROLLER MEANS CARRIED BY SAID SUPPORT MEANS AND HAVING AN EDGE ADAPTED TO ENGAGE UPON SAID TOP OF SAID OUTER FORM AND TO BE DRIVEN BY ENGAGEMENT THEREWITH WHEN SAID OUTER FROM IS ROTATED, SECOND ROLLER MEANS CARRIED BY SAID SUPPORT MEANS HAVING AN EDGE OF GREATER DIAMETER THAN SAID FIRST ROLLER MEANS FOR COMPACTING THE 